SC9256S View Datasheet(PDF) - Silan Microelectronics
Part Name
Description
Manufacturer
SC9256S Datasheet PDF : 24 Pages
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Silan
Semiconductors
SC9256
Crystal oscillator pins (XT, XT )
As fig.2 shows, the clock necessary for internal operation is produced by connecting a crystal oscillator between
capacitors. Use the crystal oscillator selection bit to select an oscillating frequency of 3.6MHz, 4.5MHz, 7.2MHz or
10.8MHz which matches that of the crystal oscillator used.
LSB
Address D0H
MSB
OSC1 OSC2
OSC1
0
1
0
1
OSC2
0
0
1
1
OSCILLATOR
FREQUENCY
3.6MHz
4.5MHz
7.2MHz
10.8MHz
XT
C X'tal
Divider
XT
C C=30pF Typ.
Fig.2
Note: set to 3.6MHz (OSC1=”0” and OSC2=”0”) when power is turned on. The crystal is not oscillating at this time
because the system is in standby mode.
Reference counter (Reference frequency divider)
The reference counter section consists of a crystal oscillator and a counter.
A crystal oscillator frequency of 3.6MHZ, 7.2MHZ or 10.8MHZ can be selected .A maximum of 15 reference
frequencies can be generated.
1. Setting reference frequency
The reference frequency is set using bits R0~R3.
LSB
Address D0H
R0 R1 R2 R3
MSB
R0 R1 R2 R3
0000
1000
0100
1100
0010
1010
0110
1110
REFERENCE
FREQUENCY
0.5 KHz
1 KHz
2.5 KHz
3 KHz
3.125 KHz
*3.90654 KHz
5 KHz
6.25 KHz
R0 R1 R2 R3
REFERENCE
FREQUENCY
0001
*7.8125 KHz
1001
9 KHz
0101
10 KHz
1101
12.5 KHz
0011
25 KHz
1011
50 KHz
0111
100 KHz
1 1 1 1 Standby mode (*1)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
9
2002.01.30.
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